Electrical plug-connector.



P. KUHN.

ELECTRICAL PLUG CONNECTOR.

APPLICATION FILED 00T. 5, 1912.

Patented Aug". i8, 19M.

Ffm/9 y fy WAMWLWWM Hi vwf FRANK KUHN, 'or DETROIT, momenti.

' ELECTRICAL mue-CONNECTOR.

LMWBIS.

Specification of Letters Patent.

Patented Aug. is, i914.

Application filed October 5, 1912.I Serial'No. 724,170.

To allwh'om it may concern.' i

Be it knownthat I, FRANK KUHN, a citiz en of the United States of America, residing at Detroit, in the county of Wayne and State of Michi an, have invented` certain 5 .new and useful mprovements in Electrical Plug-Connectors, of which the following is a specification, referencebeing had therein to the accompanyin drawings.

The invention re ates to electrical connectors of the plug ty e, and it is the object of the invention to olitain a more durable construction, and one which may be manufactured at small cost.

lo this end the invention consists in the peculiar construction', arrangement and combination of parts as hereinafter set forth.

. In the drawings: Figure l is a perspective View of some of the parts of the plug detached.l Fi 2 is a longitudinal section through the p ug. Fig. 3 is a section substantially on line af-m Fig. 2. Fig. 4 is a cross section on line y-y. v

, ln the 'construction of plug connectors, it is usual to completely surround the contacts with an insulator so as to avoid accidental short circuiting. It is also common to form the insulators of a fragile material such as porcelain. In use, however, the porcelains are frequently broken so as to expose' the contacts, with a resulting danger of short circuit. With myV improved construction the insulators are effectively protected from breakagev by a metallic housing, which is of such construction that it may be struck up from a single blank'of sheet metal, and to guard against short circuiting the electrical contacts are held so as to be incapable of projecting outward beyond'the insulator.

ln detail, the insulator for the plug is formed in a plurality of sections,y and, `as

shown, comprises sections A and B, forming diderent longitudinal portions of the plug. The section B is provided with parallel recesses C for receiving pairs of contact springs D entered therein from the inner end of the section. At the outer end of the section are slots E of suiiicient Width to permit vthe entrance of the coperating electrical contacts, but preventing the outward movement of the contacts D by shoulders F. The section A is provided with a single central recess G of sufficient size to receive the knotted conductor, and having a contracted faperture H for the outward passa e of said conductor. At the outer end oft e section is a recess I of larger diameter than the vaperture H for receivingthe end of' a rcsllient'coil J, surrounding and protecting `the end of the conductor. K is ametallic case struck up from adat blank of sheet metal,'and havingianend portlon L and integral side portions M and M?, which are fashioned to surround the insulator sections A and B, with. longitudinally-extending, meetin edges. The endzs of these sections M and ld are furtherprovided with inturned Hanges N andv N which overlap the end of the section B and prevent its withdrawal from the armor.

0 is an aperture extending transversely through the artition P, which separates the recesses C ofP the 'section B.

Q are enlarged recesses at opposite ends olf-n the aperture O, and R are inwardly ...em-.

bossed portions of the armor K for fitting into said recesses and for receiving a clampin screw or rivet S, holding the opposite si e of the armor in position. An aperture L in the end L of the armor permits the passage of a conductor T-but this apertureJ ispreferably of lesser diameter than the recess I, and permits of securing the coil J by securing same in engagement therewith. f

ln assembling the parts, the conductor T may be engaged with thel aperture L of the armor and threaded through the aperture H of the section A. It is then knotted to prevent withdrawal and the ends are convnected to the contacts D by suitable screwclips such as U. These contacts are then "engaged in the recesses C of the section B and on sides M and M of the armor; are

' contracted about the sections A and B land secured by thebolt or rivet S. When thus assembled the insulators are completely incased in the armor, and the contacts D are protected from electrical connection with each other and with the metallic armor. By reason of the fact that the insulator is formed in sections, the insulator anges F may be arranged at the outer' end of the plug, and also the knotting and securing of the conductor is facilitated. On the other hand, the surrounding armor holds the two sections in fixed relation and in close contact with each other.

What I claim as my invention is:

1. An electrical plug connector comprising an insulator formed of a plurality of recessed sections placed end to end, elecing a plurality of end to end adjoining sections,"having recesses therein with entrance orificesat the inner ends of said sections, an electrical contact in one of said recesses, a Yconductor connected to said contact, having a retaining knot in the recess ofthe adjoining section, and an armor for holding said's'ections in fixed relations.

4. An electrical plug connector comprising a recessed insulator, an electrical contact in said recess, and an armor for incasing said insulator, struck up fr oin a sheet metal blank, having aniend portion and opposite side portions With longitudinally-extending, meeting edges.

'5. An electrical plug connector comprising a recessed insulator, a contact therein, a conductor connected to said contact and passing outward through one end of said insulator, and an armor struck up from a sheet 'metal blank, having an end portion apertured for the passage of said conductor, and

complementary side portions fashioned to embrace said insulator, with longitudinallyextending, meeting edges.

6. An electrical plug connector comprising a recessed insulator, contacts Within said insulator, and an armor for, said insulator struck up from a sheet metal blank, having an apertured lend portion, complementary side portions fashioned to embrace said insulator and having longitudinally-extending, meeting edges, end fianges for overlapping the opposite ends of said insulator, and across connection `for clamping said side sections in fixed. relation to each other against said insulator.

7 In an electrical plug connector, the combination With the insulator body of an armor therefor, struck up from a sheet An ietal blank, having an end section and op- ,posite side sections fashioned to embrace the ibodv, with longitudinalmeeting edges; registering, inwardly-embossed portions on said opposite side portions, and a cross connection passing through said body having headed ends engaging said inwardly embossed portions.'

8. In an electrical plug connector the combination with an insulator body aperytured for. the passage of the conductor, and ihjaving a recess in its end surrounding said aperture, of an armor foi` said insulator, provided with a registering aperture overhanging said recess, and a resilient spiral for protecting said conductor secured into engagement With said armor and seated in said recess.

9. An electrical plug connector comprising a plurality of longitudinally-adjoining insulator sections, one of said sections being provided withl parallel recesses therein, with entrance orifices at the inner end of the section, and the other section having a central recess at its inner end registering With both of said parallel recesses, electrical contacts vin said 'parallel recesses, conductors connected to said contacts, knotted to engage said central recess, and an armor inclosing said sections and holding the same in fixed relation. y i Y In testimon whereof It aiiiX my signature in presence o tWo Witnesses.

FRANK KUHN.

Witnesses JAMEs P. BARRY, DELBERT COLLINS. 

